[subresource_filter] Replace KMP by std::search.

components/subresource_filter/core/common/test_ruleset_utils.h

Index: components/subresource_filter/core/common/test_ruleset_utils.h
diff --git a/components/subresource_filter/core/common/test_ruleset_utils.h b/components/subresource_filter/core/common/test_ruleset_utils.h
index ef7086502eafe1405b44af188eaf147ea0f3fcae..d7023f86b056d16108508f917ff0444f4205004b 100644
--- a/components/subresource_filter/core/common/test_ruleset_utils.h
+++ b/components/subresource_filter/core/common/test_ruleset_utils.h
@@ -15,8 +15,13 @@
 namespace subresource_filter {
 namespace testing {
 
+// Creates a blacklist URL rule which targets subresources of any type such that
+// the resource URL ends with |suffix|.
 proto::UrlRule CreateSuffixRule(base::StringPiece suffix);
 
+// Same as CreateUrlRule(pattern, proto::URL_PATTERN_TYPE_WILDCARDED), but the
+// rule applies to the specified |activation_types|, and to no element types.
+// Additionally, it is restricted to a set of |domains| (if provided).
 proto::UrlRule CreateWhitelistRuleForDocument(
     base::StringPiece pattern,
     int32_t activation_types = proto::ACTIVATION_TYPE_DOCUMENT,